Peters



(NoIViode1.) 4She'ets-Sheet 1.

- r G. R. STETSON;

Twist Drill Grinding lvleichine.

No. 237,922. Patented Feb 15,1881.

7 2 invmwom JW" v BY ATTORNEYS.

NiPETERs, PKOTOJJTNOGRAFHER, WASHINGTON, D C.

4 Sheets-Sheet 2. G. R. STETSON.

- Twist Drill Grinding Machine.

NO; 237,922.. k Patented Feb. 15,1881

(No Model.)

INVENTOR ATTORNEYS. I

NJPET RS, PHOTO-l """GRAPHER, WASHINGTON, D 04 4 she ts-Sheet a.

(No Model.) i

G. R. ST ETSON. Twist Drill Grinding Machine. I

No. 237,922. I Patented Feb. 15,1881.

l? Q -vw i Ji w w WITNESSES: E

(No Model.) V 4 Sheets-'Sheet 4.

' .G. R.S TETS 0N. Twist Dr il'l Grinding Machinev. No. 237,922.Patented Feb. 15,1881.

flilillllllllllllllllllllllllIllll 0" 7-=hlllllllllllllllllllllIIIIIIIIlllllll l I & Mmnnnnnmnwm Illllllli IL IINVENTOR law/2 ATTORNEYS.

WITNESSES ETER 0- NOGR ERW Gr rates GEORGE R. STETSON, OF NEW BEDFORD,MASS, ASSIGNOR TO HIMSELF AND MORSE TWIST DRILL AND MACHINE COMPANY, OFSAME PLACE.

TWIST-DR ILL-GRINDING MACHINE.

SPECIFICATION formingpart of Letters Patent No. 237,922, dated February15, 1881.

Application filed November 18, 1880. (No model.)

To all whom it may concern:

Be it known that I, GEORGE R. S'rnrson, of New Bedford, in the county ofBristol and State of Massachusetts, have invented a new and ImprovedTwist-Drill-Grinding Machine,

of which the following is a specification.

The object of this invention is to provide an improved tool for theautomatic presentation ofa drill to the grinding-wheel, and for therapid and accurate grinding of said drill.

The invention consists of a sliding head adjustable on a suitablestandard, so as to be moved toward or from the grinding-wheel, andsupporting a horizontally-swinging bed,

on which is mounted a chuck or jaws for holding the drills to be ground,and supporting also an adjustable sliding plate or fulcrum, and a systemof levers connecting the same with the chuck or jaws, whereby the lattermay be vertically adjusted; and it consists, further, of a stop and adrill-guide attached to the chuck, of novel arrangement ofgrindingwheels and other parts, all of which will be hereinafterdescribed.

Figure l is a perspective view of the device. Fig. 2 is an enlarged sideelevation of the sliding head and its connections. Fig. 3 is an enlargedfront view of the same. Fig 4 is an enlarged plan of the same with chuck removed.

Fig. 5 is an enlarged sectional elevation of the same on lines 00 m,Fig. 2, and y 3 Fig. 4. Fig.

6 is a detailed sectional view of the stop and nut on the guide-rod.Fig. 7 is a section through the stop-rod, taken on line 00 m, Fig.

6. Fig. Sis a plan view of the swinging bed. Fig. 9 is a like View ofthe sliding head; Fig. 10, a sectiontaken on line w as of Fig. 8; Fig.11, an end view of the sliding head. Fig. 12 is a sectional view, takenon line 00 tr, Fig. 5,

0 showing the operating-screws; Fig. 13, a detail sectional view of thestandard, showing the head-plate, levers, and weight. Fig. 14 is asection taken on line m w of Fig. 13; and Fig. 15 is a view showinggage-levers.

5 Similar letters of reference indicate corresponding parts.

In the accompanying drawings, A represents a standard, to the upper partof which are secured vertical parallel guides A, be-

tween which is held the forward-projecting bed-plate B, that supportsthe sliding-head O and the mechanism attached thereto.

Said bed-plate B is vertically adjustable by means of an elbow-lever, D,that is operated by a handle, D, and is provided on its free end with aweight, D. Said lever D is fulcrumed within the standard A, and has oneend secured in the bed-plate B, while the other end of said lever Dextends rearward in the opposite direction from the bed-plate B throughthe standard A, and has on its end the weight D, which is adjustable onsaid lever D by means of the nut a.

0n the upper face of the bed-plate B is formed a triangular slide, B,extending from front to rear thereof, and fitting in a correspondinggroove, 1), in the bottom of the sliding head 0. Said slide B islongitudinally slotted through part of its length, as indicated at c,Fig. l, to permit of the movement of the lug d, that projects downwardfrom the slid-. ing head 0 into the chamberf of the bedplate B, as shownin Figs. 2 and 5. A screw, E, having a band-wheel, E, on its outer end,is entered through the front of the bed-plate B, through the chamber f,and through the screw-threaded lug d of the sliding head 0. A fixedscrew, E parallel with the screw E, is also entered into the chamber f,through the front of the bed-plate B, and passed through the ear d ofthe lug d. On turning the screw E in one direction the sliding head G ismoved from the standard A until the lug d abuts against the front of thechamber f, and on turning said screw E in the opposite direction thesliding head 0 is moved toward the standardA. until the lug ear (1 abutsagainst a check-nut, f, fixed on the free end of the screw E and in thismanner the adjustment of the tools to be ground to or from the grind- 9oing-wheel is effected.

In order to tighten the slidiu g head 0 laterally in position a plate,g, is introduced in one side of its groove 1), and pressed inward, asmaybe required, by the set-screws g g, against 5 the slide B.

The sliding head G has a curved groove, h, formed horizontally in itsface, and extending partly around its sides, to accommodate theclamping-plate h of the swinging bed F, and

above this groove h the face of the sliding head 0 is extended forwardand on one side,

in the form of a quarter-circle, as shown at 2', Fig. 4, against whichthe inner face of the cor respondingly-curveddownward-projectin grim hof said swinging bed F slides as said bedF is moved to the right orleft. Set-screws i 05, entered through the rim h, where it is madethicker for the better holding of them, with their ends flush with theinside thereof, may be turned in against the rim of the circle i, tocompensate for any wear between the face of said circle i and the innerface of the rim h so that the swinging bed F sh all always swing evenlyand without too much play. This swinging bed F is in the shape of asegment of a circle, with an open center at k, about which is a circularprojection, 1 having a rectangular projection, g, that extends to thethicker part of the rim [L2, and resting on top of the sliding head 0.Said bed F is held in place by means of the cylindrical neck G of thecircular cap G, which cap Gr, resting on top of the swinging bed F, isheld immovably in place by the projection of the neck G down through theopen center 7; of the swinging bed F into a shallow circular socket, k,in the top of the slidinghead O, and,further, by the studs P, thatproject downward into corresponding sockets in the sliding head 0, and,further, by a screw-bolt, 16 that passes down through the center of saidcap G into the sliding head (J. This cap G has a downward-projectingrim, 1, formed on the periphery for about three-quan ters of itscircumference, which fits around the circular piece 9 as shown in Figs.2 and 5, of the swinging bed F, and serves, by its termini, to formshoulders l, that limit the swing of the said bed F by operating asstops for the contact of the edges of the rectangular projection y whensaid swinging bed F is moved to the right or left.

On the top of the cap G, on either side of its central bolt-hole, arethe parallel guides or slides G that form an integral part of said capG, or may be attached thereto. Between these slides G is a slidingplate, H, having beveled edges to correspond with the inner faces of theguides G and having oil-holes m, that are closed with screws m. Thissliding plate H serves as the fulcrum for the system of levers, as willbe hereinafter explained.

An upright standard, I, is bolted on the rectangular projection g of theswinging bed F, and has journ alcd in it, at right angles thereto, thechuck I, the upper jaw, 1 of which is adjustable by means of the hand-wheel and screw 1 said jaws I l bcin g designed to grasp and hold thedrill (represented at K) against the face of the grinding-wheel. Thenuts a, screwed on the end of the chuck-arbor 1 hold the chuck I to thestandard I, but so that said chuck I is free to rotate in averticalplane, and as the swinging bed F may be moved in a horizontal plane theoperator is e11- abled to present the lip of the drill K at any desiredangle to the grinding-wheel.

Secured on the front of the lower jaw, 1 of the chuck I by a bolt, 0, isa slotted guide or gage, K, whose forward curved and upwardprojectingfmgeris designed to enter the groove or lip of a drill, for thepurpose of regulating and limiting the adjustment and revolution of suchdrill relatively to the grinding-wheel, said guide or gage K beingvertically adjustable, by reason of its slot, for adaptation to drillsof different sizes.

Screwed or otherwise secured in the rear end of the upper jaw, I, of thechuck I, and in line with the face of said jaw 1 is a rod, L, projectingrearward, and serving as a holder and guide for the adjustable stop L,that serves as a support for the rear end of the drill K. Said stop Lconsists of a nut, p, fitted over the rod L, and having formed on itsrear end alarger collar, 1;, that is radially split, and provided withperforated lugs, (shown in Fig. 7,) through the perforations of which ahandled screw, 12, is passed for drawing said lugs together, and therebytightening said nut 11 on the rod L; and projecting inward from saidcollar 12 is a spline, 1), that enters a corresponding keyway, q, in therod L, whereby said nut 12 can slide on said rod L without turning. Thenut 19 is provided with an annular groove on its outside to receive thepoint of the set-screw q, that holds the slide L of the stop L on thesaid nut 12, so that said slide L may be freely rotated to accommodateitself to the end of a drill. Said slide L is provided on its face witha raised edge, q, that serves as a lateral brace against the end of thedrill K.

The system of levers that operate for adjust ing the chuck I to increaseor diminish the clearanceof the drill-lip relatively tothegrinding-wheelconsists of a lever, M, pivoted so as to move in a horizontal plane by ascrewbolt, 1', in the sliding plate H, said lever M being composed of arod, M, that enters a tube M whose open end is split and encircled witha tightening-nut, r, so that said lever M may be extended or expanded,as may be desired, for suitable adjustment of the chuck I. The oppositeend of this leverMis connected with the rear end of a lever, N, by aswiveljoint, N, the forward end of said lever N being pivoted on ahorizontal pin, 1, between the lugs of a rigid hanger, N", that dependsfrom the under side of the chuck 1. 1n the lever N is a vertical slot,1' down through which is projected a rigid tongue, 1 from the bottom ofthe said chuck I, whereby a better leverage is had by the levers M N onthe chuck I I when the swinging bed F is rotated.

When the machine holding a drill is adjusted as shown in Fig. 2, thepivoting-point 1' of the lever system M N, and their point of attachmentN with the chuck I, are at their farthest points apart, and the saidchuck I is consequently inclined forward, so as to elevate the drill Kin such a manner that the center of the web of said drill Kthe extremepoint of the drillshall press against the verticallyrevolvinggrinding-wheel 0. As the operator, taking hold of the rod L, moves theouter end of said rod L to the right, the swinging bed F is therebyrevolved and the points rN brought nearer to each other, with the effectof lengthening the said lever system M N, and thereby bringing the chuckI. to an upright position, and the drill K to a horizontal position.

In grinding drills from half to one and a half inch in diameter, set thelip of the drill beyond the guide-finger Kenough to secure the necessarystock for grinding without cutting the guide. Larger drills shouldproject beyond the guide from one-fourth to one-half inch.

The cross-slide or sliding plate H serves as a fulcrum for the levers MN, and, being ad- 1 justable, controls the said levers, and so securesmore or less clearance for the lip of the drill K. When the slidingplate H is set so that the zero-marks s 8 shall correspond, sufficientworking clearance is secured. If, on small drills, more clearance forthe lip is desired, move the sliding plate H to the right. After movingthe sliding plate H readjust the angle of the chuck I by drawing out thelever M until the mark 7) on the said chuck I corresponds with the mark1; on the standard I, the work being carried to the extreme left, or inposition to commence its work. Any desired angle is secured by drawingout or shortening this lever M.

The marks '1; 0) indicate the angles drills are usually ground to. It isnot necessary to move the drill up or down during the grinding.

In using the machine the lip of the drill K is placed against the fingerof the guide K, which latter can be adjusted to accommodate differentsizes of drills. Then the slide L is moved upon the rod L until it bearsagainst the end of the drill; then the work is moved up to thegrinding-wheel O by turning the screw E, swinging the work to the rightsufficiently to complete the clearance of the drilllip, which brings thedrill K in about a horizontal position, with the web or center thereofagainst the wheel 0. Then the operator swings the bed F around by meansof the rod L until the said bed F strikes the left-hand stop Z, workingeasily without forcing the work. Then, when sufficient of the drill hasbeen ground, the checknut f is turned up against the lug-ear d, toprevent farther rearward movement of the sliding head 0. Then the drillmay be removed and replaced in position for grinding the second lip,working the sliding head 0 up to the chuck -nutf, as in the firstgrinding.

The grinding-wheel O, that should make about three thousand four hundredrevolutions a minute, is preferably a free-cutting corundum-wheel, No.46. It is fixed on an end of a horizontal shaft, 0 which is journaled insuitable boxes P, that are supported on standards P projecting upwardfrom the top of the standard A.

Q represents a suitable guard over the wheel 0. This guard Q is closedat its lower end, and provided with a waste-water pipe, Q, for

conducting the said waste water therefrom to a suitable receiver, Q Thewheel 0 is supplied with water from a vessel, Q, arranged on top of saidguard, as shown in Fig. 1 of drawings. Under the guard Q is suitablysupported a pan, 1, designed to collect any drops or dashes of waterthrown by the wheel outside the guard. This pan has no outlet, but is tobe removed by hand, when necessary, and emptied of any water thrown outby the wheel and collected therein.

R represents the driving-pulley of the wheel 0, fixed on the shaft 0 andS represents an edge-grinding wheel for thinning the webs of the drillswhen they have become thickened by grinding on the-wheel O.

T represents a rest fixed on a standard, P,

for resting a drill upon for holding its web against the wheel S.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. In a twist-drill-grinding machine, the combination,with the swinging bed F, of the standard I, stem 1 and chuck 1 and jawsI 1 substantially as herein shown and described, whereby a drill may beheld and presented at any desired angle to a grinding-wheel, as setforth.

2. In atwist-drill-grinding machine, the combination, with the chuck 1,upper chuck-jaw, I and lower chuck-jaw, 1 of the adjustable gage K,substantially as herein shown and described, whereby the adjustment andrevolution of the drill are determined, as set forth.

3. In a twist-drill-grindin g machine, the combination, with the slidingplate H, of the adjustable levers M N, connected with chuck I, stem 1and jaws I 1 substantially as herein shown and described, whereby motionis imparted to the drill or jaws, causing a movement that increases theclearance of the drill, or enables the grinding-wheel to remove morestock toward the end of the motion of the swinging table, as set forth.

4. In atwist-drill-grinding machine, the combination, with the cap G,provided with guides G and levers M N, of the movable lever-fulcrum orsliding plate H, standard I, chuck I, stem 1, andjaws I 1 substantiallyas herein shown and described, whereby the clearance of the drill isregulated, as set forth.

5. In a twist-drill-grindin g machine, the combination, with theadjustable sliding head 0, of the swinging head F, having an opencenter, circular cap G, provided with neck G, and guides G slidingfulcrum or plate H, adjustable levers M N, and standard I, supportingchuck I, having jaws I I gage K, and hanger N arranged and operatedsubstantially as herein shown and described.

GEORGE RIPLEY STETSON.

Witnesses:

FRANCIS B. GREENE, LEwrs B. HoLMEs.

IIO

